On Tue, 6 Jan 1998, Elie Rosenblum wrote:
> And thus spake Craig Sanders, on Wed, Jan 07, 1998 at 01:52:06AM +1100:
> > is there any debian policy on number of file descriptors compiled into the
> > kernel? (and also in limits.h in libc6-dev - AFAIK pretty much everything
> > that uses select() will need to be recompiled if the limit is increased).
>
> This has been sysctl configurable in the runtime kernel since at most 2.0,
> probably 1.3.
>
> deliverator:[~]-#cd /proc/sys/kernel/
> deliverator:[/proc/sys/kernel]-#ls -l *-max *-nr
> -rw-r--r-- 1 root root 0 Jan 6 13:40 file-max
> -r--r--r-- 1 root root 0 Jan 6 13:40 file-nr
> -rw-r--r-- 1 root root 0 Jan 6 13:40 inode-max
> -r--r--r-- 1 root root 0 Jan 6 13:40 inode-nr
> deliverator:[/proc/sys/kernel]-#cat file-max inode-max
> 1024
> 4096
> deliverator:[/proc/sys/kernel]-#echo 2048>file-max; echo 8192>inode-max
> deliverator:[/proc/sys/kernel]-#cat file-max inode-max
> 2048
> 8192
> deliverator:[/proc/sys/kernel]-#
so why have there been patches to increase the number of available fd's
right up until recent kernel versions (e.g. 2.0.30)? here's what happens on
my 2.0.32 system:
[EMAIL PROTECTED] [08:41:43] kernel# cd /proc/sys/kernel/
[EMAIL PROTECTED] [08:41:58] kernel# ls -l *-max *-nr
-rw-r--r-- 1 root root 0 Jan 7 08:40 file-max
-r--r--r-- 1 root root 0 Jan 7 08:40 file-nr
-rw-r--r-- 1 root root 0 Jan 7 08:40 inode-max
-r--r--r-- 1 root root 0 Jan 7 08:40 inode-nr
[EMAIL PROTECTED] [08:42:34] kernel# cat file-max inode-max
1024
3072
[EMAIL PROTECTED] [08:42:41] kernel# echo 2048>file-max; echo
8192>inode-max
bash: file-max: Bad file descriptor
bash: inode-max: Bad file descriptor
[EMAIL PROTECTED] [08:42:48] kernel# cat file-max inode-max
1024
3072
strange. your system reports 1024 and 4096 for file-max and inode-max.
mine reports 1024 and 3072. yours allows it to be changed. mine doesn't.
what kernel version are you running? any patches? standard
linux-x.x.x.tar.gz or a debian patched kernel-source-x.x.x.deb (many of
the debian kernels were patched with various fixes and enhancements -
maybe debian's kernel should come with the linux "big-mama" or "big-mama's
best child" patch sets)?
anyway, here's what i'm running:
[EMAIL PROTECTED] [08:42:52] kernel# uname -a
Linux siva.taz.net.au 2.0.32 #1 Wed Dec 3 10:31:25 EST 1997 i486 unknown
bash seems to know that 256 fd's are available per process.
[EMAIL PROTECTED] [08:47:36] kernel# ulimit -a | grep files
open files 256
squid too (from the cachemgr.cgi):
File descriptor usage for squid:
Maximum number of file descriptors: 256
Largest file desc currently in use: 25
Number of file desc currently in use: 25
Available number of file descriptors: 231
Reserved number of file descriptors: 64
craig
--
craig sanders
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